Leicester City on a three-year contract for an undisclosed fee. He made his debut on 17 August 2011 in a 2–1 loss to Bristol City. After a row with manager Nigel Pearson on being unhappy about being dropped for the Boxing Day fixture against Ipswich Town, St Ledger was told he would never play for the Midlands club again and was transfer listed. Leicester and Ipswich Town agreed a fee for the defender but Ipswich manager Paul Jewell said although everything was agreed an injury in training to Leicester defender Aleksander Tunchev put the deal on hold as St Ledger was needed for cover. After Sol Bamba also left for the 2012 Africa Cup of Nations the following week Leicester were forced to bring St Ledger back into the team because of lack of cover. St Ledger impressed on being brought back into the team, with Pearson saying he was "delighted with his performances," so much so that he was taken off the transfer list and his proposed transfer to Ipswich was cancelled. St Ledger then became a permanent fixture in Nigel Pearson's side throughout the 2011–12 season. However, ahead of the 2012–13 season, St Ledger sustained a knee injury in a pre-season friendly match against Burton Albion and missed the start of the season. St Ledger made his first league appearance of the season on 1 September, playing at right-back in a 1–0 win over Blackpool. He then had a run of games in the first-team until pulling his hamstring in a 2–0 win over Bristol City on 6 October, an injury which required specialist treatment in Germany. By January, he had resumed light training. After making his recovery from injury, St Ledger joined Millwall on an emergency loan that will keep him until the end of the season. On 28 May 2013, St Ledger announced he had been told he was surplus to requirements and had been advised to look for a new club. He made his first appearance of the 2013–14 season in Leicester's 2–1 opening day win over Middlesbrough and in the League Cup he scored the winner in a 2–1 win over Wycombe Wanderers. These would turn out to be his only appearances of the season as he suffered a recurrence of the knee injury that caused him to miss a large part of the previous season. Despite this, he was presented with a winner's